6191101661 has 2 divisors, whose sum is σ = 6191101662. Its totient is φ = 6191101660.

The previous prime is 6191101589. The next prime is 6191101669. The reversal of 6191101661 is 1661011916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3670057561 + 2521044100 = 60581^2 + 50210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6191101661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6191101669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3095550830 + 3095550831.

It is an arithmetic number, because the mean of its divisors is an integer number (3095550831).

Almost surely, 2^6191101661 is an apocalyptic number.

It is an amenable number.

6191101661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6191101661 is an equidigital number, since it uses as much as digits as its factorization.

6191101661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 6191101661 is about 78683.5539423582. The cubic root of 6191101661 is about 1836.2112553235.

The spelling of 6191101661 in words is "six billion, one hundred ninety-one million, one hundred one thousand, six hundred sixty-one".